// this file was borrowed from linux kernel
// originally it has name /usr/src/linux/include/linux/iso_fs.h
// unfortunately there was no copyright header on it,
// so i`m assume it have copyrighted under terms of
// GNU GENERAL PUBLIC LICENSE version 2
// as a whole linux kernel
// copy of this license included into fuseiso
// distribution in file COPYING

#ifndef _ISOFS_FS_H
#define _ISOFS_FS_H

#include <linux/types.h>
/*
 * The isofs filesystem constants/structures
 */

/* This part borrowed from the bsd386 isofs */
#define ISODCL(from, to) (to - from + 1)

struct iso_volume_descriptor
{
    char type[ISODCL(1,1)];                                           /* 711 */
    char id[ISODCL(2,6)];
    char version[ISODCL(7,7)];
    char data[ISODCL(8,2048)];
};

/* volume descriptor types */
#define ISO_VD_PRIMARY 1
#define ISO_VD_SUPPLEMENTARY 2
#define ISO_VD_END 255

#define ISO_STANDARD_ID "CD001"

struct iso_primary_descriptor
{
    char type           [ISODCL (  1,   1)];                          /* 711 */
    char id             [ISODCL (  2,   6)];
    char version            [ISODCL (  7,   7)];                      /* 711 */
    char unused1            [ISODCL (  8,   8)];
    char system_id          [ISODCL (  9,  40)];                      /* achars */
    char volume_id          [ISODCL ( 41,  72)];                      /* dchars */
    char unused2            [ISODCL ( 73,  80)];
    char volume_space_size      [ISODCL ( 81,  88)];                  /* 733 */
    char unused3            [ISODCL ( 89, 120)];
    char volume_set_size        [ISODCL (121, 124)];                  /* 723 */
    char volume_sequence_number [ISODCL (125, 128)];                  /* 723 */
    char logical_block_size     [ISODCL (129, 132)];                  /* 723 */
    char path_table_size        [ISODCL (133, 140)];                  /* 733 */
    char type_l_path_table      [ISODCL (141, 144)];                  /* 731 */
    char opt_type_l_path_table  [ISODCL (145, 148)];                  /* 731 */
    char type_m_path_table      [ISODCL (149, 152)];                  /* 732 */
    char opt_type_m_path_table  [ISODCL (153, 156)];                  /* 732 */
    char root_directory_record  [ISODCL (157, 190)];                  /* 9.1 */
    char volume_set_id      [ISODCL (191, 318)];                      /* dchars */
    char publisher_id       [ISODCL (319, 446)];                      /* achars */
    char preparer_id        [ISODCL (447, 574)];                      /* achars */
    char application_id     [ISODCL (575, 702)];                      /* achars */
    char copyright_file_id      [ISODCL (703, 739)];                  /* 7.5 dchars */
    char abstract_file_id       [ISODCL (740, 776)];                  /* 7.5 dchars */
    char bibliographic_file_id  [ISODCL (777, 813)];                  /* 7.5 dchars */
    char creation_date      [ISODCL (814, 830)];                      /* 8.4.26.1 */
    char modification_date      [ISODCL (831, 847)];                  /* 8.4.26.1 */
    char expiration_date        [ISODCL (848, 864)];                  /* 8.4.26.1 */
    char effective_date     [ISODCL (865, 881)];                      /* 8.4.26.1 */
    char file_structure_version [ISODCL (882, 882)];                  /* 711 */
    char unused4            [ISODCL (883, 883)];
    char application_data       [ISODCL (884, 1395)];
    char unused5            [ISODCL (1396, 2048)];
};

/* Almost the same as the primary descriptor but two fields are specified */
struct iso_supplementary_descriptor
{
    char type           [ISODCL (  1,   1)];                          /* 711 */
    char id             [ISODCL (  2,   6)];
    char version            [ISODCL (  7,   7)];                      /* 711 */
    char flags          [ISODCL (  8,   8)];                          /* 853 */
    char system_id          [ISODCL (  9,  40)];                      /* achars */
    char volume_id          [ISODCL ( 41,  72)];                      /* dchars */
    char unused2            [ISODCL ( 73,  80)];
    char volume_space_size      [ISODCL ( 81,  88)];                  /* 733 */
    char escape         [ISODCL ( 89, 120)];                          /* 856 */
    char volume_set_size        [ISODCL (121, 124)];                  /* 723 */
    char volume_sequence_number [ISODCL (125, 128)];                  /* 723 */
    char logical_block_size     [ISODCL (129, 132)];                  /* 723 */
    char path_table_size        [ISODCL (133, 140)];                  /* 733 */
    char type_l_path_table      [ISODCL (141, 144)];                  /* 731 */
    char opt_type_l_path_table  [ISODCL (145, 148)];                  /* 731 */
    char type_m_path_table      [ISODCL (149, 152)];                  /* 732 */
    char opt_type_m_path_table  [ISODCL (153, 156)];                  /* 732 */
    char root_directory_record  [ISODCL (157, 190)];                  /* 9.1 */
    char volume_set_id      [ISODCL (191, 318)];                      /* dchars */
    char publisher_id       [ISODCL (319, 446)];                      /* achars */
    char preparer_id        [ISODCL (447, 574)];                      /* achars */
    char application_id     [ISODCL (575, 702)];                      /* achars */
    char copyright_file_id      [ISODCL (703, 739)];                  /* 7.5 dchars */
    char abstract_file_id       [ISODCL (740, 776)];                  /* 7.5 dchars */
    char bibliographic_file_id  [ISODCL (777, 813)];                  /* 7.5 dchars */
    char creation_date      [ISODCL (814, 830)];                      /* 8.4.26.1 */
    char modification_date      [ISODCL (831, 847)];                  /* 8.4.26.1 */
    char expiration_date        [ISODCL (848, 864)];                  /* 8.4.26.1 */
    char effective_date     [ISODCL (865, 881)];                      /* 8.4.26.1 */
    char file_structure_version [ISODCL (882, 882)];                  /* 711 */
    char unused4            [ISODCL (883, 883)];
    char application_data       [ISODCL (884, 1395)];
    char unused5            [ISODCL (1396, 2048)];
};

#define HS_STANDARD_ID "CDROM"

struct  hs_volume_descriptor
{
    char foo            [ISODCL (  1,   8)];                          /* 733 */
    char type           [ISODCL (  9,   9)];                          /* 711 */
    char id             [ISODCL ( 10,  14)];
    char version            [ISODCL ( 15,  15)];                      /* 711 */
    char data[ISODCL(16,2048)];
};

struct hs_primary_descriptor
{
    char foo            [ISODCL (  1,   8)];                          /* 733 */
    char type           [ISODCL (  9,   9)];                          /* 711 */
    char id             [ISODCL ( 10,  14)];
    char version            [ISODCL ( 15,  15)];                      /* 711 */
    char unused1            [ISODCL ( 16,  16)];                      /* 711 */
    char system_id          [ISODCL ( 17,  48)];                      /* achars */
    char volume_id          [ISODCL ( 49,  80)];                      /* dchars */
    char unused2            [ISODCL ( 81,  88)];                      /* 733 */
    char volume_space_size      [ISODCL ( 89,  96)];                  /* 733 */
    char unused3            [ISODCL ( 97, 128)];                      /* 733 */
    char volume_set_size        [ISODCL (129, 132)];                  /* 723 */
    char volume_sequence_number [ISODCL (133, 136)];                  /* 723 */
    char logical_block_size     [ISODCL (137, 140)];                  /* 723 */
    char path_table_size        [ISODCL (141, 148)];                  /* 733 */
    char type_l_path_table      [ISODCL (149, 152)];                  /* 731 */
    char unused4            [ISODCL (153, 180)];                      /* 733 */
    char root_directory_record  [ISODCL (181, 214)];                  /* 9.1 */
};

/* We use this to help us look up the parent inode numbers. */

struct iso_path_table
{
    unsigned char  name_len[2];                                       /* 721 */
    char extent[4];                                                   /* 731 */
    char  parent[2];                                                  /* 721 */
    char name[0];
} __attribute__((packed));

/* high sierra is identical to iso, except that the date is only 6 bytes, and
   there is an extra reserved byte after the flags */

struct iso_directory_record
{
    char length         [ISODCL (1, 1)];                              /* 711 */
    char ext_attr_length        [ISODCL (2, 2)];                      /* 711 */
    char extent         [ISODCL (3, 10)];                             /* 733 */
    char size           [ISODCL (11, 18)];                            /* 733 */
    char date           [ISODCL (19, 25)];                            /* 7 by 711 */
    char flags          [ISODCL (26, 26)];
    char file_unit_size     [ISODCL (27, 27)];                        /* 711 */
    char interleave         [ISODCL (28, 28)];                        /* 711 */
    char volume_sequence_number [ISODCL (29, 32)];                    /* 723 */
    unsigned char name_len      [ISODCL (33, 33)];                    /* 711 */
    char name           [0];
} __attribute__((packed));

#define ISOFS_BLOCK_BITS 11
#define ISOFS_BLOCK_SIZE 2048

#define ISOFS_BUFFER_SIZE(INODE) ((INODE)->i_sb->s_blocksize)
#define ISOFS_BUFFER_BITS(INODE) ((INODE)->i_sb->s_blocksize_bits)

#define ISOFS_SUPER_MAGIC 0x9660

#ifdef __KERNEL__
/* Number conversion inlines, named after the section in ISO 9660
   they correspond to. */

#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include <linux/iso_fs_i.h>
#include <linux/iso_fs_sb.h>

static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
{
    return sb->s_fs_info;
}


static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
{
    return container_of(inode, struct iso_inode_info, vfs_inode);
}


static inline int isonum_711(char *p)
{
    return *(u8 *)p;
}


static inline int isonum_712(char *p)
{
    return *(s8 *)p;
}


static inline unsigned int isonum_721(char *p)
{
    return le16_to_cpu(get_unaligned((__le16 *)p));
}


static inline unsigned int isonum_722(char *p)
{
    return be16_to_cpu(get_unaligned((__le16 *)p));
}


static inline unsigned int isonum_723(char *p)
{
    /* Ignore bigendian datum due to broken mastering programs */
    return le16_to_cpu(get_unaligned((__le16 *)p));
}


static inline unsigned int isonum_731(char *p)
{
    return le32_to_cpu(get_unaligned((__le32 *)p));
}


static inline unsigned int isonum_732(char *p)
{
    return be32_to_cpu(get_unaligned((__le32 *)p));
}


static inline unsigned int isonum_733(char *p)
{
    /* Ignore bigendian datum due to broken mastering programs */
    return le32_to_cpu(get_unaligned((__le32 *)p));
}


extern int iso_date(char *, int);

struct inode;                                                         /* To make gcc happy */

extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);

int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);

extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
extern struct buffer_head *isofs_bread(struct inode *, sector_t);
extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);

extern struct inode *isofs_iget(struct super_block *sb,
unsigned long block,
unsigned long offset);

/* Because the inode number is no longer relevant to finding the
 * underlying meta-data for an inode, we are free to choose a more
 * convenient 32-bit number as the inode number.  The inode numbering
 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
static inline unsigned long isofs_get_ino(unsigned long block,
unsigned long offset,
unsigned long bufbits)
{
    return (block << (bufbits - 5)) | (offset >> 5);
}


/* Every directory can have many redundant directory entries scattered
 * throughout the directory tree.  First there is the directory entry
 * with the name of the directory stored in the parent directory.
 * Then, there is the "." directory entry stored in the directory
 * itself.  Finally, there are possibly many ".." directory entries
 * stored in all the subdirectories.
 *
 * In order for the NFS get_parent() method to work and for the
 * general consistency of the dcache, we need to make sure the
 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
 * the many redundant entries for each directory.  We normalize the
 * block and offset by always making them point to the "."  directory.
 *
 * Notice that we do not use the entry for the directory with the name
 * that is located in the parent directory.  Even though choosing this
 * first directory is more natural, it is much easier to find the "."
 * entry in the NFS get_parent() method because it is implicitly
 * encoded in the "extent + ext_attr_length" fields of _all_ the
 * redundant entries for the directory.  Thus, it can always be
 * reached regardless of which directory entry you have in hand.
 *
 * This works because the "." entry is simply the first directory
 * record when you start reading the file that holds all the directory
 * records, and this file starts at "extent + ext_attr_length" blocks.
 * Because the "." entry is always the first entry listed in the
 * directories file, the normalized "offset" value is always 0.
 *
 * You should pass the directory entry in "de".  On return, "block"
 * and "offset" will hold normalized values.  Only directories are
 * affected making it safe to call even for non-directory file
 * types. */
static inline void
isofs_normalize_block_and_offset(struct iso_directory_record* de,
unsigned long *block,
unsigned long *offset)
{
    /* Only directories are normalized. */
    if (de->flags[0] & 2)
    {
        *offset = 0;
        *block = (unsigned long)isonum_733(de->extent)
            + (unsigned long)isonum_711(de->ext_attr_length);
    }
}


extern struct inode_operations isofs_dir_inode_operations;
extern struct file_operations isofs_dir_operations;
extern struct address_space_operations isofs_symlink_aops;
extern struct export_operations isofs_export_ops;

/* The following macros are used to check for memory leaks. */
#ifdef LEAK_CHECK
#define free_s leak_check_free_s
#define malloc leak_check_malloc
#define sb_bread leak_check_bread
#define brelse leak_check_brelse
extern void * leak_check_malloc(unsigned int size);
extern void leak_check_free_s(void * obj, int size);
extern struct buffer_head * leak_check_bread(struct super_block *sb, int block);
extern void leak_check_brelse(struct buffer_head * bh);
#endif                                                                /* LEAK_CHECK */
#endif                                                                /* __KERNEL__ */
#endif
